Yamaha SR400 2014 Service Manual page 92

b
a
c. A position where the AC magneto "T" mark
matches the crankcase alignment mark is the
compression top dead center (TDC).
d. Measure the valve clearance with a thickness
gauge "1".
Out of specification  Adjust.
Thickness gauge
90890-03180
Feeler gauge set
YU-26900-9
1
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4. Adjust:
• Valve clearance
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a. Loosen the locknut "1".
b. Insert a thickness gauge between the end of
the adjusting screw and the valve stem end.
c. Turn the adjusting screw "2" in direction "a" or
"b" until the specified valve clearance is ob-
tained.
PERIODIC MAINTENANCE
Direction "a"
Valve clearance is increased.
Direction "b"
Valve clearance is decreased.
Tappet adjusting tool (4 mm)
90890-04133
Six piece tappet set
YM-A5970
• Hold the adjusting screw to prevent it from
moving and tighten the locknut to specifica-
tion.
Locknut
27 Nm (2.7 m·kgf, 20 ft·lbf)
d. Measure the valve clearance again.
e. If the valve clearance is still out of specifica-
tion, repeat all of the valve clearance adjust-
ment steps until the specified clearance is
obtained.
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5. Install:
• Exhaust tappet cover "1"
• O-ring "2"
New
6. Install:
• Intake tappet cover
• O-ring
New
• Spark plug
• Spark plug cap
3-6
2
a
b
1
2
1